Here are the first screenshots of Mozilla's first operating system (OS). It's not a PC OS, but a significant feat for an organization as collaborated as Mozilla. News of Mozilla working on its own OS first surfaced in July 2011, it was then interpreted as a "boot-to-web" OS along the lines of Google's Chrome OS. It now appears Boot-to-Gecko's primary focus is on the portable computing market, primarily tablets and smartphones, as a possible 100% royalty-free option to manufacturers. In the screenshots, the phone dialer and main menu are pictured. Boot-to-Gecko will be detailed by Mozilla's CTO at the Mobile Web Congress.